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Modality shares its root with the word mode, meaning the way in which something happens or is experienced. A sensory modality is a way of sensing, like vision or hearing. Modality in someone's voice gives a sense of the person's mood. In logic, modality has to do with whether a proposition is necessary, possible, or impossible.
modal. adj. 1. of, relating to, or characteristic of mode or manner. 2. (Grammar) grammar (of a verb form or auxiliary verb) expressing a distinction of mood, such as that between possibility and actuality. The modal auxiliaries in English include can, could, may, must, need, ought, shall, should, will, and would.